Apologies for the delay for getting part 3 of the Stihl chain series to you. It's probably worth a very quick recap on what we've done so far, before carrying on with this part. Let's take a look at this Stihl chain...
...from what we know so far, it's not one of the latest chains as it has the pitch marked on it, rather than just a single identifying number. How do I know that? Because it says "3/8" on the depth gauge of the cutter - therefore it's a 3/8" pitch chain. For a bonus point, how would still now mark a chain with this pitch?
Now look at the drive link, that's got a 6 on it. So now, double or quits... what does this number tell you? No peeking!
So how did you do so far? The new chain would mark the depth gauge with the number "3" for a 3/8" chain. The 6 on the drive link tells you that it's a 1.6mm gauge chain. Knowing this, we can tell this is a model 36 chain. But in this post we want to know about the letters that Stihl would use to identify this chain.
The third character of the model identifier is a letter and it is either an "R" or a "P". The "R" denotes a Rapid chain, a "P" is for a Picco chain. What's the difference? The Rapid chain is a standard height chain and is the one shown in the picture. The Picco chain is a lighter-weight chain often found on the smaller chainsaws. One quick thing, the older Picco chains were easily identified as they had the letter "P" stamped on to the depth gauge, and Picco chains were 3/8" pitch.
So, we now know that the chain in this image is a model 36R-something, and in the next post we'll have a look at what the 'something' is.